﻿<!DOCTYPE html>
<html>
<head>
  <title>Drawing Commands</title>
  <!-- Copyright 1998-2021 by Northwoods Software Corporation. -->
  <meta name="description" content="The DrawCommandHandler extension implements various commands for aligning and rotating objects and for handling arrow keys to select or shift." />
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <script src="../release/go.js"></script>
  <script src="../assets/js/goSamples.js"></script>  <!-- this is only for the GoJS Samples framework -->
  <script src="DrawCommandHandler.js"></script>
  <script id="code">
    function init() {
      if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this

      var $ = go.GraphObject.make;  // for conciseness in defining templates

      myDiagram = $(go.Diagram, "myDiagramDiv",  // create a Diagram for the DIV HTML element
        {
          commandHandler: new DrawCommandHandler(),  // defined in DrawCommandHandler.js
          "commandHandler.archetypeGroupData": { isGroup: true },
          "undoManager.isEnabled": true  // enable undo & redo
        });

      // define a simple Node template
      myDiagram.nodeTemplate =
        $(go.Node, "Auto",  // the Shape will go around the TextBlock
          { locationSpot: go.Spot.Center },
          $(go.Shape, "RoundedRectangle", { strokeWidth: 0 },
            // Shape.fill is bound to Node.data.color
            new go.Binding("fill", "color")),
          $(go.TextBlock,
            { margin: 8 },  // some room around the text
            // TextBlock.text is bound to Node.data.key
            new go.Binding("text", "key"))
        );

      // but use the default Link template, by not setting Diagram.linkTemplate

      // create the model data that will be represented by Nodes and Links
      myDiagram.model = new go.GraphLinksModel(
        [
          { key: "Alpha", color: "lightblue" },
          { key: "Beta", color: "orange" },
          { key: "Gamma", color: "lightgreen" },
          { key: "Delta", color: "pink" }
        ],
        [
          { from: "Alpha", to: "Beta" },
          { from: "Alpha", to: "Gamma" },
          { from: "Gamma", to: "Delta" }
        ]);
    }

    function askSpace() {
      var space = prompt("Desired space between nodes (in pixels):", "0");
      return space;
    }

    // update arrowkey function
    function arrowMode() {
      // no transaction needed, because we are modifying the CommandHandler for future use
      var move = document.getElementById("move");
      var select = document.getElementById("select");
      var scroll = document.getElementById("scroll");
      var tree = document.getElementById("tree");
      if (move.checked === true) {
        myDiagram.commandHandler.arrowKeyBehavior = "move";
      } else if (select.checked === true) {
        myDiagram.commandHandler.arrowKeyBehavior = "select";
      } else if (scroll.checked === true) {
        myDiagram.commandHandler.arrowKeyBehavior = "scroll";
      } else if (tree.checked === true) {
        myDiagram.commandHandler.arrowKeyBehavior = "tree";
      }
    }
  </script>
</head>
<body onload="init()">
<div id="sample">
  <!-- The DIV for the Diagram needs an explicit size or else we won't see anything.
       Also add a border to help see the edges. -->
  <div id="myDiagramDiv" style="border: solid 1px black; width:400px; height:400px"></div>
  <p>
    Align:
    <button onclick="myDiagram.commandHandler.alignLeft()">Left Sides</button>
    <button onclick="myDiagram.commandHandler.alignRight()">Right Sides</button>
    <button onclick="myDiagram.commandHandler.alignTop()">Tops</button>
    <button onclick="myDiagram.commandHandler.alignBottom()">Bottoms</button>
    <button onclick="myDiagram.commandHandler.alignCenterX()">Center X</button>
    <button onclick="myDiagram.commandHandler.alignCenterY()">Center Y</button>
    <button onclick="myDiagram.commandHandler.alignRow(askSpace())">Row</button>
    <button onclick="myDiagram.commandHandler.alignColumn(askSpace())">Column</button>
    </br>
    Rotate:
    <button onclick="myDiagram.commandHandler.rotate(45)">45°</button>
    <button onclick="myDiagram.commandHandler.rotate(-45)">-45°</button>
    <button onclick="myDiagram.commandHandler.rotate(90)">90°</button>
    <button onclick="myDiagram.commandHandler.rotate(-90)">-90°</button>
    <button onclick="myDiagram.commandHandler.rotate(180)">180°</button>
    </br>
    Z-Order:
    <button onclick="myDiagram.commandHandler.pullToFront()">Pull to Front</button>
    <button onclick="myDiagram.commandHandler.pushToBack()">Push to Back</button>
    </br>
    Arrow Mode:
    <input type="radio" name="arrow" id="move" onclick="arrowMode()" checked="checked">Move</input>
    <input type="radio" name="arrow" id="select" onclick="arrowMode()">Select</input>
    <input type="radio" name="arrow" id="scroll" onclick="arrowMode()">Scroll</input>
    <input type="radio" name="arrow" id="tree" onclick="arrowMode()">Tree</input>
  </p>
  <p>
    This example demonstrates a custom <a>CommandHandler</a>.
    It allows the user to position selected Parts in a diagram relative to each other,
    overrides <a>CommandHandler.doKeyDown</a> to allow handling the arrow keys in additional manners,
    and uses a "paste offset" so that pasting objects will cascade them rather than place them on top of one another.
    It is defined in its own file, as <a href="DrawCommandHandler.js">DrawCommandHandler.js</a>.
  </p>
  <p>
    The above buttons can be used to align Parts, rotate Parts, or change the behavior of the arrow keys.
  </p>
  <p>
    Usage can also be seen in the <a href="../projects/bpmn/BPMN.html">BPMN Editor</a> sample.
  </p>
</div>
</body>
</html>